#include<bits/stdc++.h>
#define ll long long
#define ull unsigned long long
using namespace std;

const ll N = 2e5 + 10, INF = 0x3f3f3f3f;

ll n;
string s;
ll pre[N];

void solve()
{
    cin >> n >> s;
    for (ll i = 0;i < n;i++) {
        pre[i + 1] = pre[i];
        if (s[i] == '0') pre[i + 1]--;
        else pre[i + 1]++;
    }

    ll ans = 0;
    for (ll len = 1;len <= n;len++) {
        ans += len * (n - len + 1);
    }

    sort(pre, pre + n + 1);
    for (ll i = 0;i <= n;i++)
        ans += pre[i] * (2 * i - n);

    cout << ans / 2 << '\n';
}

signed main()
{
    // ios::sync_with_stdio(0);
    // cin.tie(0);cout.tie(0);
#define ONLINE_JUDGE
#ifndef ONLINE_JUDGE
    std::istringstream in(R"()");
    std::cin.rdbuf(in.rdbuf());
#endif
    ll T = 1;
    cin >> T;
    for (ll i = 1;i <= T;i++) {
        solve();
    }
}